SPINNING MACHINE
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a spinning machine.
2. Description of the Related Art
A spinning machine includes: a pneumatic spinning device configured to produce a yarn by an airflow, a winding device configured to wind the yarn produced by the pneumatic spinning device to form a package, a yarn accumulating device arranged between the pneumatic spinning device and the winding device and configured to temporarily accumulate the yarn fed from the pneumatic spinning device and to feed the yarn to the winding device, and a driving section configured to rotate the package in the winding device (see, for example, Japanese Patent Application Laid-Open No. 2019-104596) .
One index of the quality of the package formed by the spinning machine is the unwinding property of the yarn from the package in the subsequent process. The subsequent process is a process carried out on the package by a machine different from the spinning machine after the completion of the package by the spinning machine. Examples of a factor that lowers the unwinding

properties of the yarn include ribbon winding in which the yarn is wound around the same path on the peripheral surface of the package, and latching in which yarn breakage occurs due to excessive tension resulting from entanglement of hairiness. Ribbon winding and sloughing resulting from the ribbon winding can be avoided by forming a package in a winding form with a specific winding ratio. An unwinding tension (average unwinding tension) is a factor that lowers the unwinding properties of the yarn. When the unwinding tension is different in one package, yarn breakage may occur when the yarn is unwound. Therefore, even if the ribbon winding and the latching could be avoided, if the unwinding tension is different in one package, the unwinding properties are deteriorated, so that the package quality is deteriorated.
BRIEF SUMMARY OF THE INVENTION An object of one aspect of the present invention
is to provide a spinning machine capable of improving
quality of a package.
A spinning machine comprises: a spinning device
configured to produce a yarn; a winding device configured
to wind the yarn produced by the spinning device to form

a package; a yarn accumulating device arranged between the spinning device and the winding device, the yarn accumulating device configured to temporarily accumulate the yarn continuously fed from the spinning device and to feed the yarn to the winding device; a traverse device arranged between the yarn accumulating device and the winding device, the traverse device configured to traverse the yarn to be wound into the one package; a driving section configured to rotate the one package in the winding device; a winding speed acquisition section configured to acquire a winding speed of the yarn to be wound into the package; and a control section configured to control the driving section and the traverse device based on a number of rotations per unit time of the package and the winding speed to control a winding ratio and a winding angle of the package.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a spinning machine
according to an embodiment;
FIG. 2 is a side view of a spinning unit of the
spinning machine illustrated in FIG. 1;
FIG. 3 is a side view illustrating a yarn
accumulating device;

FIG. 4 is a view illustrating a traverse device;
FIG. 5 is a diagram schematically illustrating a drum speed and a traverse speed; and
FIGS. 6A, 6B, and 6C are diagrams illustrating the relationship between the diameter of the package and the winding speed.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.
As illustrated in FIG. 1, a spinning machine 1 includes a plurality of spinning units 2, a yarn joining cart 3, a doffing cart (not illustrated) , a first end frame 4, and a second end frame 5. The plurality of spinning units 2 are arranged in a row. Each of the spinning units 2 is configured to produce a yarn Y to wind the yarn Y around a package P. When the yarn Y is cut, or is broken for some reason in a spinning unit 2, the yarn joining cart 3 is configured to perform a yarn joining operation in the spinning unit 2. When the

package P is fully-wound in a spinning unit 2, the doffing cart is configured to doff the package P and to supply a new winding bobbin B to the spinning unit 2. The first end frame 4 accommodates a collecting device or the like configured to collect a fiber waste, a yarn waste, and the like occurring in the spinning units 2.
The second end frame 5 accommodates an air supplying section configured to adjust air pressure of compressed air (air) to be supplied to each section of the spinning machine 1 and to supply the air to each section, a drive motor configured to supply power to each section of the spinning unit 2, and the like. The second end frame 5 is provided with a machine control device (setting section) 100, a touch panel screen 102, and an input key 104. The machine control device 100 is configured to intensively manage and control each section of the spinning machine 1. The touch panel screen 102 can display information relating to set contents and/or a status, or the like of the spinning units 2. The operator can perform the setting operation of the spinning unit 2 by performing an appropriate operation using the button displayed on the touch panel screen 102, the input key 104, or the like.
As illustrated in FIGS. 1 and 2, each spinning unit

2 includes a draft device 6, a pneumatic spinning device 7, a yarn monitoring device 8, a tension sensor 9, a yarn accumulating device 11, a waxing device 12, a traverse device 13, and a winding device 14 in this order from upstream in a travelling direction of the yarn Y. A unit controller (winding speed acquisition section, control section) 10 is provided for every predetermined number of spinning units 2, and controls the operation of the spinning units 2.
The draft device 6 is configured to draft a fiber bundle (sliver) S. The draft device 6 includes a back roller pair 15, a third roller pair 16, a middle roller pair 17, and a front roller pair 18 in this order from upstream in a travelling direction of the fiber bundle S.
The back roller pair 15 includes a driving-side back bottom roller 15a and a driven-side back top roller 15b. The back bottom roller 15a and the back top roller 15b face each other across a travelling path along which the fiber bundle S is caused to travel. The third roller pair 16 includes a driving-side third bottom roller 16a and a driven-side third top roller 16b. The third bottom roller 16a and the third top roller 16b face each other across a travelling path along which the fiber bundle S

is caused to travel. The middle roller pair 17 includes a driving-side middle bottom roller 17a and a driven-side middle top roller 17b. The middle bottom roller 17a and the middle top roller 17b face each other across a travelling path along which the fiber bundle S is caused to travel. The front roller pair 18 includes a driving-side front bottom roller 18a and a driven-side front top roller 18b. The front bottom roller 18a and the front top roller 18b face each other across a travelling path along which the fiber bundle S is caused to travel.
The back bottom roller 15a, the third bottom roller 16a, the middle bottom roller 17a, and the front bottom roller 18a are rotated at different rotation speeds by a drive motor provided in the spinning unit 2 so that the more downstream the roller, the faster. An apron belt 19a is provided with respect to the middle bottom roller 17a. An apron belt 19b is provided with respect to the middle top roller 17b. The front bottom roller 18a may be driven by a drive motor in the second end frame 5 provided in common for the plurality of spinning units 2.
The back top roller 15b, the third top roller 16b, the middle top roller 17b, and the front top roller 18b are rotatably supported by a draft cradle (not

illustrated) . The back top roller 15b, the third top roller 16b, the middle top roller 17b, and the front top roller 18b are respectively driven and rotated by being brought into contact with the back bottom roller 15a, the third bottom roller 16a, the middle bottom roller 17a, and the front bottom roller 18a at a predetermined pressure.
The pneumatic spinning device 7 produces the yarn
Y by applying twists, by the whirling airflow, to the fiber bundle S drafted by the draft device 6. The pneumatic spinning device 7 continuously spins the yarn
Y at a constant speed. Although detailed description and illustration will be omitted, the pneumatic spinning device 7 includes a fiber guiding section, a whirling airflow generating nozzle, and a hollow guide shaft body. The fiber guiding section guides the fiber bundle S fed from the draft device 6 to a spinning chamber formed inside the pneumatic spinning device 7. The whirling airflow generating nozzle is arranged at a periphery of a path of the fiber bundle S to generate the whirling airflow in the spinning chamber. This whirling airflow causes a fiber end of the fiber bundle S in the spinning chamber to be reversed and to be whirled. The hollow guide shaft body guides the yarn Y from the spinning

chamber to an outside of the pneumatic spinning device 7.
The yarn monitoring device 8 is configured to monitor information on the travelling yarn Y between the pneumatic spinning device 7 and the yarn accumulating device 11, and to detect presence or absence of a yarn defect based on the information acquired by the monitoring. When detecting the yarn defect, the yarn monitoring device 8 transmits a yarn defect detection signal to the unit controller 10. The yarn monitoring device 8 detects, for example, a thickness abnormality of the yarn Y and/or a foreign substance contained in the yarn Y as the yarn defect. The yarn monitoring device 8 also detects a yarn breakage or the like.
The tension sensor 9 is configured to measure tension of the travelling yarn Y between the pneumatic spinning device 7 and the yarn accumulating device 11, and to transmit a tension measurement signal to the unit controller 10. When the unit controller 10 determines a presence of an abnormality based on a detection result of the yarn monitoring device 8 and/or the tension sensor 9, the yarn Y is cut in the spinning unit 2. Specifically, air supply to the pneumatic spinning device 7 is stopped and the production of the yarn Y is

interrupted, whereby the yarn Y is cut. Alternatively, the yarn Y may be cut with a cutter separately provided.
The yarn accumulating device 11 accumulates the yarn Y between the pneumatic spinning device 7 and the winding device 14. The yarn accumulating device 11 has a function of applying a predetermined tension to the yarn Y and pulling out the yarn Y from the pneumatic spinning device 7, a function of accumulating the yarn Y fed from the pneumatic spinning device 7 at the time of yarn joining by the yarn joining device 2 6 and the like to prevent slackening of the yarn Y, and a function of adjusting the tension so that fluctuation of the tension on the winding device 14 side is not transmitted to the pneumatic spinning device 7 side.
As illustrated in FIG. 3, the yarn accumulating device 11 includes a yarn accumulating roller 30, a yarn hooking member 31, an upstream guide 32, a downstream guide 33, a yarn accumulated amount sensor (accumulated state detection section) 34, and an electric motor 35.
The yarn accumulating roller 30 winds a yarn Y around the outer peripheral surface thereof to accumulate the yarn Y. The yarn accumulating roller 30 is rotatably driven by the electric motor 35. The motion of the electric motor 35 is controlled by the unit

controller 10. The yarn Y wound around the outer peripheral surface of the yarn accumulating roller 30 is wound so as to tighten the yarn accumulating roller 30 by the rotation of the yarn accumulating roller 30, and pulls the upstream yarn Y with respect to the yarn accumulating device 11. That is, by rotating the yarn accumulating roller 30 with the yarn Y wound around the outer peripheral surface at a predetermined rotation speed, the yarn accumulating device 11 applies a predetermined tension to the yarn Y, pulls out the yarn Y from the pneumatic spinning device 7 at a predetermined speed, and feeds the yarn Y downstream at a predetermined speed.
The yarn hooking member 31 is configured capable of having the yarn Y to be engaged (hooked) (in contact) . The yarn hooking member 31 is integrally rotated with the yarn accumulating roller 30 while being engaged with the yarn Y to wind the yarn Y around the outer peripheral surface of the yarn accumulating roller 30. The yarn hooking member 31 is provided at a downstream end potion of the yarn accumulating roller 30, and is relatively rotatable with respect to the yarn accumulating roller 30. A magnetic force resisting the relative rotation with respect to the yarn accumulating roller 30 acts on

the yarn hooking member 31. Therefore, in a state where a predetermined tension or more is not generated on the yarn Y, the yarn hooking member 31 integrally rotates with the yarn accumulating roller 30, and the yarn Y is wound (accumulated) around the yarn accumulating roller 30. In a state where a tension greater than a predetermined tension is generated on the yarn Y, the yarn hooking member 31 is relatively rotated with respect to the yarn accumulating roller 30, and the yarn Y is unwound from the yarn accumulating roller 30.
The upstream guide 32 is arranged upstream of the yarn accumulating roller 30. The upstream guide 32 is a guiding member configured to appropriately guide the yarn Y with respect to the outer peripheral surface of the yarn accumulating roller 30, and also serves as a twist stopping function of preventing the twists of the yarn Y propagated from the pneumatic spinning device 7 from being propagated downstream of the upstream guide 32.
The downstream guide 33 is arranged downstream of the yarn accumulating roller 30. The downstream guide 33 is configured to guide (regulate) the yarn path of the yarn Y unwound from the yarn accumulating roller 30. The downstream guide 33 stabilizes the yarn path of the

yarn Y from the yarn accumulating roller 30 to the winding device 14.
The yarn accumulated amount sensor 34 detects, in a non-contact manner, the accumulated amount (state) of the yarn Y accumulated on the yarn accumulating roller 30. In the present embodiment, the yarn accumulated amount sensor 34 detects the accumulated amount of the yarn Y in a partial region of the yarn accumulating roller 30. The yarn accumulated amount sensor 34 outputs a binary value (signal) of ON/OFF. The yarn accumulated amount sensor 34 outputs an ON signal if the yarn Y is detected on the yarn accumulating roller 30, and outputs an OFF signal if the yarn Y is not detected. The yarn accumulated amount sensor 34 transmits the detection result to the unit controller 10 (see FIG. 1).
In the yarn accumulating device 11, the yarn Y is accumulated so that a distance D between an unwinding point at which the yarn Y is unwound from the yarn accumulating roller 30 (a point at which the yarn Y is separated from the outer surface of the yarn accumulating roller 30) and an engaging point at which the yarn Y is engaged (a contact point at which the yarn Y is in contact) with the yarn hooking member 31 is 10 cm or less. The distance D is set depending on the accumulated

amount of the yarn Y. The unit controller 10 controls the drive motor 23 described below so that the distance D is 10 cm or less.
As illustrated in FIGS. 1 and 2, the waxing device 12 applies wax to the yarn Y between the yarn accumulating device 11 and the winding device 14.
As illustrated in FIG. 4, the traverse device 13 traverses the yarn Y within a predetermined width with respect to the rotating winding bobbin B or the package P. The traverse device 13 traverses the yarn Y to be wound into one package P. In other words, one spinning unit 2 is provided with one traverse device 13. The traverse device 13 includes a traverse motor 13a, a driving pulley 13b, driven pulleys 13c and 13d, a driving belt 13e, and a traverse guide 13f.
The traverse motor 13a is, for example, a stepping motor or a servo motor. The traverse motor 13a rotationally drives the driving pulley 13b. The motion of the traverse motor 13a is controlled by the unit controller 10. The driving pulley 13b is rotationally driven in forward and reverse directions by the traverse motor 13a. The driven pulleys 13c and 13d are provided on both sides of the traverse range. The driving belt 13e is stretched over the driving pulley 13b and the

driven pulleys 13c and 13d. The traverse guide 13f can guide the yarn Y, and is fixed to the driving belt 13e. The traverse guide 13f traverses the yarn Y according to the movement of the driving belt 13e.
A position detection sensor configured to detect a position may be provided with respect to at least any one of the traverse motor 13a and the traverse guide 13f. This makes it possible to perform accurate position control of the traverse guide 13f.
In the traverse device 13, the driving pulley 13b is rotated in forward and reverse directions by the drive of the traverse motor 13a, whereby the traverse guide 13f fixed to the driving belt 13e is driven to be reciprocated in the axial direction of the winding drum 22. Thus, the traverse guide 13f traverses the yarn Y within a predetermined width with respect to the rotating winding bobbin B or the package P. In the traverse device 13, by changing the rotation speed of the traverse motor 13a, the traverse speed (moving speed of the traverse guide 13f) is changed.
As illustrated in FIGS. 1 and 2, the winding device 14 winds the yarn Y around the winding bobbin B to form a package P. The winding device 14 includes a cradle arm 21 and a winding drum 22. The cradle arm 21

rotatably supports the winding bobbin B. The cradle arm 21 is swingably supported by a supporting shaft 24, and brings a surface of the winding bobbin B or a surface of the package P into contact with a surface of the winding drum 22 at an appropriate pressure. For this purpose, the cradle arm 21 is provided with an air cylinder or the like.
The winding drum 22 is rotationally driven by a drive motor (driving section) 23 (see FIG. 4). The drive motor 23 is, for example, a brushless motor. The drive motor 23 drives one winding drum 22. That is, the drive motor 23 rotates one package P. Furthermore, in other words, one spinning unit 2 is provided with one winding drum 22 and one drive motor 23. Thus, in each spinning unit 2, the winding bobbin B or the package P is independently rotated in the winding direction. The motion of the drive motor 23 is controlled by the unit controller 10. Since each spinning unit 2 includes a separate drive motor 23, the rotational drive of the winding drum 22 can be controlled for each spinning unit 2.
As illustrated in FIG. 4, the spinning unit 2 includes a rotation sensor (rotation detection section) 25 configured to detect the number of rotations per unit

time (hereinafter simply referred to as "the number of rotations") of the drive motor 23, that is, the number of rotations per unit time (hereinafter simply referred to as "the number of rotations") of the winding drum 22 (package P). The rotation sensor 25 transmits a detection result to the unit controller 10 (see FIG. 1). As illustrated in FIGS. 1 and 2, when the yarn Y is cut or the yarn Y is broken for some reason in a spinning unit 2, the yarn joining cart 3 travels to the relevant spinning unit 2 to perform the yarn joining operation. The yarn joining cart 3 includes a yarn joining device 26, a suction pipe 27 and a suction mouth 28. The suction pipe 27 is rotatably supported by a supporting shaft 27a, and is configured to capture the yarn Y from the pneumatic spinning device 7 and to guide the captured yarn Y to the yarn joining device 26. The suction mouth 28 is rotatably supported by a supporting shaft 27b, and is configured to capture the yarn Y from the winding device 14 and to guide the yarn Y to the yarn joining device 26. The yarn joining device 26 is configured to join the guided yarns Y together. The yarn joining device 26 is a splicer using compressed air, a knotter configured to mechanically join the yarn Y, or the like.

Next, the control executed by the unit controller 10 will be described in detail.
The unit controller 10 controls the drive motor 23 and the traverse device 13 based on the number of rotations of the package P and the winding speed of the yarn Y to control the winding ratio and the winding angle of the package P. The winding ratio is the number of times the package P is rotated while the yarn Y is traversed for one reciprocation in the width direction of the package P (axial direction of the winding bobbin B) . The winding angle is an angle formed by the yarn Y wound into the package P with respect to a direction orthogonal to the axial direction of the winding bobbin B. The winding angle is determined by the rotational speed (winding speed) of the package P and the traverse speed of the traverse guide 13f of the traverse device 13. The winding angle is a ratio between the rotational speed and the traverse speed. In order to make the winding angle constant, the ratio between the rotational speed and the traverse speed is made constant.
The winding ratio and the winding angle are set in the machine control device 100. The operator sets the winding ratio and the winding angle from a predetermined setting screen of the touch panel screen 102.

A numerical value including a value of at least a decimal point can be set as the winding ratio. The winding ratio may be input by an operator as a numerical value, may be selected from among a plurality of values (safe winding ratios) set in advance in the machine control device 100, or may be selected from among a plurality of items (for example, setting 1, setting 2, and the like).
The winding angle may be input by an operator as a numerical value, may be selected from among a plurality of numerical values set in advance in the machine control device 100, or may be selected from among a plurality of items. The winding angle may be a value including a predetermined range (for example, a° or more and (3° or less) .
The unit controller 10 controls the drive motor 23 and the traverse device 13 so that the winding ratio and the winding angle set in the machine control device 100 are obtained.
The unit controller 10 acquires the number of rotations of the winding drum 22, that is, the number of rotations of the package P based on the detection result of the rotation sensor 25. In addition, the unit controller 10 calculates the drum speed, which is the

rotational speed of the winding drum 22, based on the detection result of the rotation sensor 25. The drum speed can also be said as a rotational speed of the package P.
The unit controller 10 acquires, based on the detection result of the yarn accumulated amount sensor 34, an actual average winding speed (hereinafter, simply referred to as "winding speed") of the yarn Y wound into the package P. Hereinafter, a method for acquiring the winding speed by the unit controller 10 will be described.
The unit controller 10 controls (changes) the drum speed by controlling the drive motor 23 based on the detection result of the yarn accumulated amount sensor 34. The control will be described with reference to FIG. 5. With regard to the "drum speed" in FIG. 5, the solid line indicates the actual drum speed, and the broken line indicates the reference speed.
When the spinning operation is started in the spinning unit 2, the unit controller 10 controls the drive motor 23 to rotate the winding drum 22 so that the drum speed reaches a reference speed based on the spinning speed set based on the lot, the winding ratio, and the winding angle of the package P. The unit controller 10 accelerates or decelerates the drum speed

in stages based on the detection result of the yarn accumulated amount sensor 34.
As illustrated in FIG. 5, in the present embodiment, the unit controller 10 controls the drum speed with two-speed control. Specifically, the unit controller 10 linearly decelerates or accelerates the drum speed between a first speed (constant speed) and a second speed
(constant speed). The unit controller 10 accelerates or decelerates the drum speed so that no slip occurs between the winding drum 22 and the package P. In a fixed period including a period (time) in which the drum speed is set to a constant speed and a period (time) in which the drum speed is accelerated/decelerated, the unit controller 10 sets the period (time) in which the drum speed is accelerated/decelerated to 25% or less, preferably 10% or less of the fixed period. In other words, the unit controller 10 controls the period (time) in which the drum speed is set to the constant speed to be more than 75% in the fixed period.
When the yarn Y is fed from the yarn accumulating roller 30 of the yarn accumulating device 11 and the yarn accumulated amount sensor 34 outputs the OFF signal,
the unit controller 10 controls the drive motor 23 to decelerate the drum speed from the first speed to the

second speed (portion surrounded by broken line in FIG. 5). When the winding drum 22 is rotated with the drum speed as the second speed, the accumulated amount of the yarn Y of the yarn accumulating roller 30 increases. When the accumulated amount of the yarn Y of the yarn accumulating roller 30 increases and the yarn accumulated amount sensor 34 outputs the ON signal, the unit controller 10 controls the drive motor 23 to accelerate the drum speed from the second speed to the first speed (portion surrounded by broken line in FIG. 5). When the winding drum 22 is rotated with the drum speed as the first speed, the accumulated amount of the yarn Y of the yarn accumulating roller 30 decreases.
The unit controller 10 controls the drive motor 23 so that the first speed is 0.5% or more and 10% or less with respect to the current reference speed and the second speed is -0.5% or more and -10% or less with respect to the current reference speed. The unit controller 10 repeatedly performs the acceleration and deceleration of the drum speed based on the detection result of the yarn accumulated amount sensor 34. In the present embodiment, the acceleration and deceleration of the package P are performed by controlling the rotation of the drive motor 23 in a state where the contact

between the package P and the winding drum 22 is maintained.
The unit controller 10 calculates the winding speed based on the detection result (ON/OFF) of the yarn accumulated amount sensor 34. The unit controller 10 calculates the cycle times tl and t2 based on the ON period in which the ON signal continues and the OFF period in which the OFF signal continues.
In FIG. 5, the cycle time tl is a time (period) during which the ON signal continues, and the cycle time t2 is a time (period) during which the OFF signal continues. The unit controller 10 calculates the winding speed based on the cycle time tl and the cycle time t2. In the actual control, the winding speed is calculated based on a plurality of cycle times. In FIG. 5, the cycle times tl and t2 are illustrated to have the same time length. However, the winding device 14 may be controlled so that the longer the winding of the package P after the yarn joining operation is continued, the longer the time length of each cycle time.
The unit controller 10 corrects the reference speed based on the calculated winding speed. The unit controller 10 corrects (changes, adjusts) the reference speed so that the reference speed and the winding speed

are the same. That is, when the winding speed is deviated from the reference speed, the unit controller 10 corrects the reference speed so that the reference speed matches the winding speed.
In the example illustrated in FIG. 5, the unit controller 10 performs correction for lowering the reference speed. The unit controller 10 may change the reference speed at once, or may change the reference speed linearly, curvilinearly, or stepwise. In the example in FIG. 5, even when the reference speed changes, the speed difference between the first speed and the reference speed is the same, and the speed difference between the second speed and the reference speed is the same. However, the drive motor 23 may be controlled so that the speed difference decreases in accordance with the progress of the winding of the package P.
When the winding of the yarn Y into the package P (bobbin B) is started, that is, when the diameter of the package P is relatively small, the fluctuation of the winding speed is large. Therefore, the unit controller 10 corrects the reference speed in a short cycle. When the diameter of the package P becomes relatively large, the unit controller 10 corrects the reference speed in a long cycle. After the reference speed is corrected,

the unit controller 10 controls the drive motor 23 (controls the drum speed) based on the corrected reference speed.
The unit controller 10 controls the winding ratio of the package P based on the number of rotations of the package P and the traverse speed. The unit controller 10 controls the drive motor 23 and the traverse motor 13a based on the number of rotations and the reference speed of the winding drum 22 to form the package P by the step precision winding.
The step precision winding is a winding method in which a winding ratio is switched stepwise, the winding ratio being a ratio between the number of rotations of the package P and the number of times of traversing per unit time by the traverse device 13. According to the step precision winding, the yarn Y is wound into the package P while maintaining the winding angle within a fixed range close to a predetermined angle (target winding angle) by switching the winding ratio stepwise. In the step precision winding, when the current winding ratio approaches the critical winding ratio at which the ribbon winding occurs, the following series of control is repeated. That is, the series of control is control of rapidly changing the winding angle (traverse jump)

from the state where the winding ratio is constant so as to avoid the winding ratio from becoming the critical winding ratio, and thereafter returning the winding ratio to a constant state. According to the step precision winding, the yarn Y can be wound with no ribbon winding region occurring and with the yarn diamonds of the package P aligned (with the adjacent yarn diamonds at an even pitch).
The unit controller 10 controls the winding angle of the package P by controlling the drive motor 23 and the traverse device 13 based on the drum speed. The unit controller 10 synchronizes a cycle of acceleration/ deceleration of the drum speed with a cycle of acceleration/deceleration of the traverse speed. In the present embodiment, the unit controller 10 synchronizes a cycle of acceleration/deceleration of the traverse speed to a cycle of acceleration/deceleration of the drum speed. More specifically, the unit controller 10 synchronizes the cycle of acceleration of the traverse speed to the cycle of acceleration of the drum speed, and synchronizes the cycle of deceleration of the traverse speed to the cycle of deceleration of the drum speed. Accordingly, the ratio of the drum speed to the traverse speed becomes constant, and the winding angle

becomes constant.
The unit controller 10 may control the traverse device 13 so that the winding angle near the traverse turn of the package P (both end portions of the package P) becomes large. Specifically, the unit controller 10 divides the movement region in the traverse direction of the traverse guide 13f into a central portion and end portions other than the central portion. The unit controller 10 controls the traverse speed at the end portions to be faster than the traverse speed at the central portion while controlling the drum speed to be constant. Thus, the winding angle near the traverse turn of the package P can be increased. The change in the traverse speed accompanying this control is omitted in FIG. 5.
In addition, the unit controller 10 may change the movement region (predetermined width) of the traverse guide 13f in the traverse direction in inverse proportion to the free length (distance between the peripheral surface of the package P and the traverse guide 13f) that varies accompanying the change in the diameter of the package P.
After the yarn Y is disconnected in the spinning unit 2 and the yarn joining operation is performed, the

unit controller 10 starts the control of the winding ratio and the winding angle based on the reference speed immediately before the disconnection of the yarn Y. The accumulated amount of the yarn Y of the yarn accumulating roller 30 is large immediately after execution of the yarn joining operation. In this case, the unit controller 10 accelerates the drum speed to reduce the accumulated amount of the yarn Y in the yarn accumulating roller 30. Also in this case, the unit controller 10 synchronizes a cycle of acceleration/deceleration of the drum speed with a cycle of acceleration/deceleration of the traverse speed. Thus, the winding ratio and the winding angle can be controlled even during resumption of the winding of the package P.
The machine control device 100 may monitor the reference speed of each spinning unit 2. When there is a spinning unit 2 operating with a reference speed different from the other spinning units 2 (different by a threshold value or more) among the plurality of spinning units 2, the machine control device 100 may notify that fact. When there is a spinning unit 2 whose reference speed exceeds a predetermined speed, the machine control device 100 may notify that fact. The notification may be performed by displaying on the touch

panel screen 102, displaying on the display section of each spinning unit 2, and/or activating a buzzer or the like.
As described above, in the spinning machine 1 according to the present embodiment, since the winding ratio is controlled, the occurrence of ribbon winding and latching can be avoided. The winding angle contributes to an unwinding tension when the yarn Y is unwound from the package P in the subsequent process. When the winding angle is made constant in the package P, the unwinding tension is also made constant. The winding angle is a ratio between a rotational speed of the package P and a traverse speed, and when the ratio is made constant, the winding angle becomes constant. Therefore, in the spinning machine 1, by acquiring the actual winding speed of the yarn Y and controlling the drive motor 23 and the traverse device 13 (specifically, the traverse motor 13a) based on the winding speed, the ratio between the rotational speed (drum speed) of the package P and the traverse speed can be made constant. Thus, the winding angle can be made constant. That is, the unwinding tension can be made constant. Thus, in the spinning machine 1, by controlling both the winding ratio and the winding angle, the occurrence of defects

(ribbon winding, latching, and the like) in the package P can be avoided and the unwinding tension can be stabilized.
Furthermore, in the spinning machine 1, the yarn accumulating device 11 is provided between the pneumatic spinning device 7 and the winding device 14. Therefore, even when the tension fluctuation occurs in the yarn Y by controlling the drive motor 23 and the traverse device 13 for controlling the winding ratio and the winding angle, the tension fluctuation is absorbed by the yarn accumulating device 11. That is, the tension fluctuation is not transmitted to the pneumatic spinning device 7. As a result, since the spinning by the pneumatic spinning device 7 is not affected by the control of the winding ratio and the winding angle, the spinning machine 1 can stably produce the yarn Y by the pneumatic spinning device 7. Therefore, in the spinning machine 1, the quality of the package P can be improved. In addition, since one traverse device 13 is provided for one package P, the traverse turn (reversal) can be carried out at high speed at the end portions of the package P, and the occurrence of the stitching can also be reduced.
In the spinning machine 1 according to the present embodiment, the winding device 14 includes the winding

drum 22 that rotates in a state of being in contact with the package P. The unit controller 10 controls the drive motor 23 in a state where the package P and the winding drum 22 are in contact with each other. Thus, since the package P and the winding drum 22 do not need to be separated for controlling the winding speed, the yarn Y can be stably wound into the package P.
In the spinning machine 1 according to the present embodiment, the unit controller 10 controls the accumulated amount of the yarn Y accumulated in the yarn accumulating device 11 by controlling at least the number of rotations per unit time of the package P during the winding of the package P, and controls the winding ratio and the winding angle while controlling the accumulated amount. Thus, occurrence of defects in the package P can be avoided and the unwinding tension of the package P in the subsequent process can be stabilized. If the accumulated amount of the yarn Y becomes too large and the yarn Y overflows from the yarn accumulating device 11, the winding of the package P may not be continued, or the quality of the yarn Y pulled out from the pneumatic spinning device 7 may deteriorate. Even if the accumulated amount of the yarn Y becomes too small, the quality of the yarn Y pulled out from the pneumatic

spinning device 7 becomes unstable.
In the spinning machine 1 according to the present embodiment, the pneumatic spinning device 7 continuously spins the yarn Y at a constant speed (same speed) during the winding of the package P. That is, the spinning machine 1 is greatly different in configuration from a machine in which the yarn Y is passively supplied, such as an automatic winder. When the yarn Y is spun at a constant speed, the spinning of the yarn Y cannot be stopped or the spinning speed cannot be changed in order to control the accumulated amount of the yarn Y in the yarn accumulating device 11. Therefore, change is likely to occur in the winding speed in order to control the accumulated amount of the yarn Y. Therefore, the configuration of acquiring the winding speed and controlling the winding ratio and the winding angle of the package P is particularly effective in the configuration including the pneumatic spinning device 7 configured to continuously spin the yarn Y at a constant speed.
In the spinning machine 1 according to the present embodiment, the unit controller 10 controls the drive motor 23 and the traverse device 13 in order to control the winding angle by synchronizing a cycle of

acceleration/deceleration of the rotational speed of the drive motor 23 with a cycle of acceleration/deceleration of the traverse speed in the traverse device 13. In this configuration, since the ratio between the rotational speed of the package P and the traverse speed can be made constant by synchronizing the cycle of acceleration/deceleration of the rotational speed with the cycle of acceleration/deceleration of the traverse speed, the winding angle can be made constant. Therefore, since the unwinding tension of the package P in the subsequent process can be made constant, the quality of the package P can be improved.
In the spinning machine 1 according to the present embodiment, the unit controller 10 controls the rotational speed of the drive motor 23 in stages. In this configuration, the cycle of acceleration/ deceleration of the rotational speed and the cycle of acceleration/deceleration of the traverse speed can be appropriately synchronized.
In the spinning machine 1 according to the present
embodiment, the unit controller 10 controls the drive
motor 23 so that in a fixed period including the period
(time) in which the rotational speed is accelerated/
decelerated and the period (time) in which the rotational

speed is controlled to be a constant speed in the drive motor 23, the period (time) for performing acceleration/ deceleration is 25% or less of the fixed period. In this configuration, the time during which the rotational speed is a constant speed may be made longer than the time during which the rotational speed fluctuates. Thus, since the time during which the time during which the rotational speed is a constant speed is synchronized with the time during which the traverse speed is a constant speed becomes longer, the ratio between the rotational speed and the traverse speed can be easily kept constant.
In the spinning machine 1 according to the present embodiment, the unit controller 10 controls the rotational speed of the drive motor 23 based on the reference speed, and corrects the reference speed based on the difference between the winding speed and the reference speed. In this configuration, the deviation between the winding speed and the reference speed can be corrected. Therefore, the winding angle can be more accurately controlled.
The spinning machine 1 according to the present embodiment includes the yarn accumulated amount sensor 34 configured to detect a state of the yarn accumulated

in the yarn accumulating device 11. The unit controller 10 acquires the winding speed based on the state of the yarn Y detected by the yarn accumulated amount sensor 34. In this configuration, since the winding speed is acquired based on the state (accumulated amount, presence/absence of yarn) of the yarn Y accumulated in the yarn accumulating device 11, the winding speed can be acquired with a simple configuration.
In the spinning machine 1 according to the present embodiment, the yarn accumulating device 11 includes a yarn accumulating roller 30 configured to accumulate the yarn Y, and a yarn hooking member 31 configured to wind the yarn Y around the outer peripheral surface of the yarn accumulating roller 30. The unit controller 10 controls the drive motor 23 so that a distance between an unwinding point at which the yarn Y is unwound in the yarn accumulating roller 30 and an engaging point at which the yarn Y is engaged in the yarn hooking member 31 is 10 cm or less. In this configuration, the feeding (unwinding) of the yarn Y from the yarn accumulating device 11 is stabilized. Thus, since the occurrence of the stitching can be avoided in the package P, the control of the winding angle can be stably performed.
The spinning machine 1 according to the present

embodiment includes a rotation sensor 25 configured to detect the number of rotations per unit time of the drive motor 23, that is, the number of rotations per unit time of the winding drum 22 (package P) . In this configuration, since the number of rotations of the package P can be accurately detected, the control based on the number of rotations of the package P can be appropriately performed.
The spinning machine 1 according to the present embodiment includes a machine control device 100 configured to set the winding ratio including at least a value of a decimal point and the winding angle. In this configuration, the winding ratio and the winding angle can be optionally set in the machine control device 100.
In the spinning machine 1 according to the present embodiment, the unit controller 10 controls the drive motor 23 and the traverse device 13 so that the package P is formed by the step precision winding. In this configuration, occurrence of ribbon winding and latching can be avoided.
In the spinning machine 1 according to the present embodiment, the unit controller 10 corrects the reference speed based on the winding speed. Therefore, since a take-up ratio (ratio of the peripheral speed of

the package P to the peripheral speed of the yarn accumulating roller 30) can be automatically corrected, the operator does not need to set the take-up ratio. Therefore, the operation can be simplified.
Although the embodiment of the present invention has been described above, the present invention is not necessarily limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.
In the embodiment described above, each device is arranged so that the yarn Y supplied on the upper side is wound on the lower side in the machine height direction. However, each device may be arranged so that the yarn Y supplied on the lower side is wound on the upper side. Instead of the configuration of pulling out the yarn Y from the pneumatic spinning device 7 by the yarn accumulating roller 30, a delivery roller pair may be provided upstream of the yarn accumulating roller 30, and the yarn may be pulled out from the pneumatic spinning device 7 by the delivery roller pair.
In the embodiment described above, a mode has been described as an example in which the draft device 6 includes the back roller pair 15, the third roller pair 16, the middle roller pair 17, and the front roller pair

18. However, one or more roller pairs may be provided upstream of the back roller pair 15. In addition, the front roller pair (roller pair arranged at a position closest to the pneumatic spinning device 7 in the conveyance path of the fiber bundle S) may be configured as a part of another device. For example, the spinning unit 2 may include a supplying device configured to supply the fiber bundle S drafted by the draft device 6 to the pneumatic spinning device 7, and the front roller pair 18 may be included in a part of the supplying device The front roller pair 18 may be included in the draft device 6 configured to draft the fiber bundle S or the supplying device configured to supply the fiber bundle S to the pneumatic spinning device 7, or may be provided alone without being included in other devices.
In the embodiment described above, a mode has been described as an example in which the bottom roller of the draft device 6 is driven by the power from the second end frame 5 (that is, in common with the plurality of spinning units 2) . However, the draft device may be independently driven for each spinning unit 2.
In the embodiment described above, a mode has been described as an example in which the pneumatic spinning device 7 continuously spins the yarn Y at a constant

speed. However, the speed at which the pneumatic spinning device 7 continuously spins the yarn Y does not need to be constant.
In the embodiment described above, a mode of connecting the two yarn ends by the yarn joining device 26 has been described as an example. However, instead of the configuration in which the yarn ends are connected by the yarn joining device 26, connecting (piecing) the yarn Y from the pneumatic spinning device 7 and the yarn Y of the package P may be made by inserting the yarn Y from the package P into the pneumatic spinning device 7 and starting the drafting operation of the draft device 6 and the spinning operation of the pneumatic spinning device 7. In any case, the yarn joining cart may be omitted, and each spinning unit 2 may include a device necessary for the yarn joining.
In the embodiment described above, a mode has been described as an example in which the tension sensor 9 is arranged downstream of the yarn monitoring device 8 in the travelling direction of the yarn Y. However, the tension sensor 9 may be arranged upstream of the yarn monitoring device 8.
The unit controller 10 may be provided for each spinning unit 2.

In the spinning unit 2, the waxing device 12, the tension sensor 9, and the yarn monitoring device 8 may be omitted. In case of not applying the wax to the yarn Y, only the wax may be removed from the waxing device 12 without omitting the waxing device 12.
In the embodiment described above, a mode has been described as an example in which the magnetic force resisting the relative rotation with respect to the yarn accumulating roller 30 acts on the yarn hooking member 31 of the yarn accumulating device 11. However, the yarn hooking member 31 may be configured to be driven independently of the yarn accumulating roller 30 by a driving section (motor). Alternatively, the yarn accumulating device 11 may include a magnetic field forming means by an electromagnet, and may cause the magnetic field formed by the magnetic field forming means to act on the yarn hooking member 31 and to generate a rotational torque between the yarn accumulating roller 30 and the yarn hooking member 31.
In the embodiment described above, a mode has been described as an example in which the yarn accumulated amount sensor 34 of the yarn accumulating device 11 detects the accumulated amount of the yarn Y in a partial region of the yarn accumulating roller 30. However, the

yarn accumulated amount sensor 34 may be a line sensor. In this configuration, the yarn Y accumulated in the yarn accumulating roller 30 can be detected over a wide range. Therefore, the unit controller 10 can more finely control the acceleration/deceleration of the drum speed.
In the above embodiment, a mode has been described as an example in which the unit controller 10 controls the drum speed with two-speed control as illustrated in FIG. 5. However, the unit controller 10 may control the drum speed stepwise, and may perform, for example, three-speed control or four-speed control. When performing the three-speed control of the first speed, the second speed, and the third speed, the unit controller 10 linearly accelerates or decelerates the drum speed in the transition period between the first speed and the second speed, and linearly accelerates or decelerates the drum speed in the transition period between the second speed and the third speed.
In the embodiment described above, a mode has been described as an example in which the unit controller 10 calculates the cycle times tl and t2 based on the ON period in which the ON signal continues and the OFF period in which the OFF signal continues in the yarn accumulated amount sensor 34, and calculates the winding

speed based on the cycle time tl and the cycle time t2. However, the unit controller 10 may calculate the winding speed based on a duty ratio (duty cycle) of the sensor gain of the yarn accumulated amount sensor 34.
In the embodiment described above, a mode has been described as an example in which the unit controller 10 calculates the winding speed based on the detection result of the yarn accumulated amount sensor 34. However, the winding speed may be detected by a yarn speed detection device (speed detection section) configured to detect the speed of the travelling yarn Y. The yarn speed detection device may be independently provided, or may be incorporated in the yarn monitoring device 8. In any case, the yarn speed detection device is arranged, for example, between the yarn accumulating device 11 and the winding device 14.
The winding speed may be calculated based on the detection result of the tension sensor 9. Specifically, the winding speed is calculated from the relationship (S-S curve) between the tension of the yarn Y measured by the tension sensor 9 and the elongation of the yarn Y. In these configurations, particularly in the yarn speed detection device, the winding speed can be more accurately acquired. Thus, since the reference speed can

be more appropriately corrected, the winding ratio and the winding angle can be more appropriately controlled.
In the embodiment described above, a mode has been described as an example in which the number of rotations of the package P is detected by the rotation sensor 25. However, the spinning unit 2 may be provided with a sensor configured to detect the inclination of the cradle arm 21 and a sensor configured to detect the number of rotations of the winding drum 22, and the number of rotations of the package P may be calculated based on the detection results of these sensors. Alternatively, the number of rotations of the winding drum 22 may be calculated based on an elapsed time (time length) from the start of winding of the yarn Y around the empty winding bobbin B.
In FIGS. 1 and 4, the spinning machine 1 is illustrated to wind a cheese-shaped package P, but can also wind a conical package. In the case of the conical package, since the diameter of the package P is different in the axial direction of the winding bobbin B, the change in the winding speed can be remarkable. In the conical package, when the diameter of the package becomes large, the winding speed changes due to factors such as a slip occurring between the package and the winding

drum 22 and a change in a drive point of the package on the winding drum 22.
FIGS. 6A, 6B, and 6C are diagrams illustrating the relationship between the diameter of the package and the winding speed. FIG. 6A illustrates a case where the drive point is positioned at the center of the package. FIG. 6B illustrates a case where the drive point is positioned on the larger-diameter side of the package. FIG. 6C illustrates a case where the drive point is positioned on the smaller-diameter side of the package. As illustrated in FIGS. 6A, 6B, and 6C, in the conical package, the winding speed changes according to the change in the diameter of the package. For example, as illustrated in FIG. 6B, when the drive point is positioned on the larger-diameter side of the package, the winding speed significantly becomes fast as the diameter of the package increases. In addition, as illustrated in FIG. 6C, when the drive point is positioned on the smaller-diameter side of the package, the winding speed significantly becomes slow as the diameter of the package increases. Therefore, when forming the conical package, it is particularly effective to acquire the winding speed, correct the reference speed, and control the winding ratio and the

winding angle of the package P based on the reference speed.
In the case of the conical package, a rubber band can be provided at the center of the winding drum 22. Thus, the drive point can be set at the center of the package (the position of the rubber band). In this case, the fluctuation in the winding speed can be reduced as compared with the case where the drive point is positioned on the larger-diameter side or the smaller-diameter side of the package. It should be noted that since the winding speed is acquired and the reference speed is corrected, the rubber band does not need to be used.
In addition, in the case of the conical package, in order to set the drive point to the center together with the use of the rubber band, the winding density of the yarn at the center in the width direction of the package may be increased to make the center of the package hard. In this case, the winding density at both ends of the package becomes sparse, and the size of the package becomes large. In the configuration of acquiring the winding speed, correcting the reference speed, and controlling the winding ratio and the winding angle of the package based on the reference speed, since it is

not necessary to make the center of the package hard, increase in the size of the package can be avoided.
For a material and a shape of each configuration, the present invention is not limited to the above-described material and shape, and various materials and shapes can be adopted.
A spinning machine according to one aspect of the present invention includes: a spinning device configured to produce a yarn; a winding device configured to wind the yarn produced by the spinning device to form a package; a yarn accumulating device arranged between the spinning device and the winding device, the yarn accumulating device configured to temporarily accumulate the yarn continuously fed from the spinning device and to feed the yarn to the winding device; a traverse device arranged between the yarn accumulating device and the winding device, the traverse device configured to traverse the yarn to be wound into the one package; a driving section configured to rotate the one package in the winding device; a winding speed acquisition section configured to acquire a winding speed of the yarn to be wound into the package; and a control section configured to control the traverse device and the driving section based on a number of rotations per unit time of the

package and the winding speed to control a winding ratio and a winding angle of the package.
In the spinning machine according to one aspect of the present invention, since the winding ratio is controlled, occurrence of ribbon winding and latching can be avoided. The winding angle contributes to an unwinding tension when the yarn is unwound from the package in the subsequent process. Since the unwinding tension in the package depends on the package diameter, the unwound length, the winding angle, and the like, it is desirable to control the winding angle in the spinning machine. The winding angle is a ratio between a winding speed and a traverse speed, and when the ratio is made constant, the winding angle becomes constant. Therefore, in the spinning machine, by acquiring the actual winding speed of the yarn and controlling the driving section and the traverse device based on the winding speed, the winding angle can be made constant, that is, the fluctuation in the unwinding tension due to at least the winding angle can be reduced. Thus, in the spinning machine, by controlling both the winding ratio and the winding angle, the occurrence of defects (ribbon winding, latching, and the like) in the package can be avoided and the unwinding tension can be stabilized.

Furthermore, in the spinning machine according to one aspect of the present invention, the yarn accumulating device is provided between the spinning device and the winding device. Therefore, even when the tension fluctuation occurs in the yarn by controlling the driving section and the traverse device for controlling the winding ratio and the winding angle, the tension fluctuation is absorbed by the yarn accumulating device. That is, the tension fluctuation is not transmitted to the spinning device. As a result, since the spinning by the spinning device is not affected by the control of the winding ratio and the winding angle, the spinning machine can stably produce the yarn by the spinning device. Therefore, in the spinning machine, the quality of the package can be improved. In addition, since a traverse device is provided for one package, the traverse turn (reversal) can be carried out at high speed at the end portion of the package, and the occurrence of the stitching can also be reduced.
In one embodiment, the winding device may include a winding drum configured to rotate in a state of being in contact with the package, and the control section may control the driving section in a state where the package and the winding drum are in contact with each other.

Thus, since the package and the winding drum do not need to be separated for controlling the winding speed, the yarn can be stably wound into the package.
In one embodiment, the control section may control the accumulated amount of the yarn accumulated in the yarn accumulating device by controlling at least the number of rotations per unit time of the package during the winding of the package, and may control the winding ratio and the winding angle while controlling the accumulated amount. Thus, it is possible to avoid occurrence of defects in the package and to stabilize the unwinding tension of the package in the subsequent process.
In one embodiment, the spinning device may continuously spin the yarn at a constant speed during winding of the package. When the yarn is spun at a constant speed (same speed), the spinning speed of the yarn cannot be changed in order to control the accumulated amount of the yarn in the yarn accumulating device. Therefore, change is likely to occur in the winding speed in order to control the accumulated amount of the yarn. Therefore, the configuration of acquiring the winding speed to control the winding ratio and the winding angle of the package is particularly effective

in the configuration including the spinning device configured to continuously spin the yarn at a constant speed.
In one embodiment, the control section may control the driving section and the traverse device in order to control the winding angle by synchronizing a cycle of acceleration/deceleration of the rotational speed of the driving section with a cycle of acceleration/ deceleration of the traverse speed in the traverse device In this configuration, since the ratio between the rotational speed of the package and the traverse speed can be made constant by synchronizing the cycle of acceleration/deceleration of the rotational speed of the driving section with the cycle of acceleration/ deceleration of the traverse speed, the winding angle can be made constant. Therefore, since the unwinding tension of the package in the subsequent process can be made constant, the quality of the package can be improved
In one embodiment, the control section may control a rotational speed of the driving section in stages. In this configuration, the cycle of acceleration/ deceleration of the rotational speed and the cycle of acceleration/deceleration of the traverse speed can be appropriately synchronized.

In one embodiment, in a fixed period including a period in which the rotational speed is accelerated/ decelerated and a period in which the rotational speed is controlled to be a constant speed in the driving section, the control section may control the driving section so that the period in which the acceleration/ deceleration is performed is 25% or less of the fixed period. In this configuration, the time (period) during which the rotational speed is a constant speed may be made longer than the time (period) during which the rotational speed fluctuates. Thus, since the time (period) during which the time (period) during which the rotational speed is a constant speed is synchronized with the time (period) during which the traverse speed is a constant speed becomes longer, the ratio between the rotational speed of the package and the traverse speed can be kept constant.
In one embodiment, the control section may control the rotational speed of the driving section based on a reference speed associated with a set spinning speed, and may correct the reference speed based on a difference between the winding speed and the reference speed. In this configuration, the deviation between the winding speed and the reference speed can be corrected.

Therefore, the winding angle can be more accurately controlled.
In one embodiment, the spinning machine may include an accumulated state detection section configured to detect an accumulated amount of the yarn and/or presence/absence of the yarn as a state of the yarn accumulated in the yarn accumulating device, and the winding speed acquisition section may acquire the winding speed based on a state of the yarn detected by the accumulated state detection section. In this configuration, since the winding speed is acquired based on the state (accumulated amount, presence/absence of yarn) of the yarn accumulated in the yarn accumulating device, the winding speed can be acquired with a simple configuration. That is, since it is not necessary to additionally provide a sensor for acquiring only the winding speed, the configuration of the entire spinning machine can be simplified.
In one embodiment, the spinning machine may include a speed detection section configured to detect a speed of the travelling yarn, and the winding speed acquisition section may acquire the winding speed based on a speed of the yarn detected by the speed detection section. In this configuration, since the speed of the yarn actually

wound into the package is detected, an accurate winding speed can be acquired.
In one embodiment, the yarn accumulating device may include: a yarn accumulating roller configured to accumulate the yarn by the yarn being wound around an outer peripheral surface, and a yarn hooking member configured to wind the yarn around the outer peripheral surface of the yarn accumulating roller, and the control section may control the driving section so that a distance between an unwinding point at which the yarn is unwound from the outer peripheral surface of the yarn accumulating roller and an engaging point at which the yarn is engaged in the yarn hooking member is 10 cm or less. In this configuration, the feeding (unwinding) of the yarn from the yarn accumulating device is stabilized. Thus, since the occurrence of the stitching can be avoided in the package, the control of the winding angle can be stably performed.
In one embodiment, the spinning machine may include a rotation detection section configured to detect the number of rotations of the package. In this configuration, since the number of rotations of the package can be accurately detected, the control based on the number of rotations of the package can be

appropriately performed.
In one embodiment, the spinning machine may include a setting section configured to set the winding ratio including at least a value of a decimal point and the winding angle. In this configuration, the winding ratio and the winding angle can be optionally set in the setting section. In the conventional spinning machine, the winding ratio has not been set. Generally, in the spinning machine, attention is often focused on improvement in quality of the yarn to be produced and improvement in operation efficiency of the spinning machine itself. Therefore, in the conventional spinning machine, it has not been demanded in the market to improve the quality of the package by improving the winding method of the yarn.
In one embodiment, the control section may control the driving section and the traverse device so that the package is formed by the step precision winding. In this configuration, occurrence of ribbon winding and sloughing can be avoided.

WE CLAIM
1. A spinning machine (1) comprising:
a spinning device (7) configured to produce a yarn (Y) ;
a winding device (14) configured to wind the yarn (Y) produced by the spinning device (7) to form a package (P) ;
a yarn accumulating device (11) arranged between the spinning device (7) and the winding device (14), the yarn accumulating device (11) configured to temporarily accumulate the yarn (Y) continuously fed from the spinning device (7) and to feed the yarn (Y) to the winding device (14);
a traverse device (13) arranged between the yarn accumulating device (11) and the winding device (14), the traverse device (13) configured to traverse the yarn (Y) to be wound into the one package (P);
a driving section (23) configured to rotate the one package (P) in the winding device (14);
a winding speed acquisition section (10) configured to acquire a winding speed of the yarn (Y) to be wound into the package (P); and
a control section (10) configured to control the driving section (23) and the traverse device (13) based

on a number of rotations per unit time of the package (P) and the winding speed to control a winding ratio and a winding angle of the package (P).
2. The spinning machine (1) as claimed in claim
1, wherein the winding device (14) includes a winding
drum (22) configured to rotate in a state of being in
contact with the package (P), and
wherein the control section (10) controls the driving section (23) in a state where the package (P) and the winding drum (22) are in contact with each other.
3. The spinning machine (1) as claimed in claim 1
or 2, wherein during winding of the package (P) , the
control section (10)
controls an accumulated amount of the yarn (Y) accumulated in the yarn accumulating device (11) by controlling at least a number of rotations per unit time of the package (P), and
controls the winding ratio and the winding angle while controlling the accumulated amount.
4. The spinning machine (1) as claimed in any one
of claims 1 to 3, wherein the spinning device (7)

continuously spins the yarn (Y) at a constant speed during winding of the package (P).
5. The spinning machine (1) as claimed in any one
of claims 1 to 4, wherein the control section (10)
controls the driving section (23) and the traverse device
(13) to control the winding angle by synchronizing a
cycle of acceleration/deceleration of a rotational speed
of the driving section (23) with a cycle of
acceleration/deceleration of a traverse speed in the
traverse device (13) .
6. The spinning machine (1) as claimed in claim
5, wherein the control section (10) controls a rotational
speed of the driving section (23) in stages.
7. The spinning machine (1) as claimed in claim 5
or 6, wherein in a fixed period including a period in
which the rotational speed is accelerated/decelerated
and a period in which the rotational speed is controlled
to be a constant speed in the driving section (23), the
control section (10) controls the driving section (23)
so that the period in which the acceleration/
deceleration is performed is 25% or less of the fixed

period.
8. The spinning machine (1) as claimed in claim 6
or 7, wherein the control section (10):
controls the rotational speed of the driving section (23) based on a reference speed associated with a set spinning speed, and
corrects the reference speed based on a difference between the winding speed and the reference speed.
9. The spinning machine (1) as claimed in any one
of claims 1 to 8,
comprising an accumulated state detection section (34) configured to detect an accumulated amount of the yarn (Y) and/or presence/absence of the yarn (Y) as a state of the yarn (Y) accumulated in the yarn accumulating device (11),
wherein the winding speed acquisition section (10) acquires the winding speed based on a state of the yarn (Y) detected by the accumulated state detection section (34) .
10. The spinning machine (1) as claimed in any
one of claims 1 to 8, comprising a speed detection

section configured to detect a speed of the travelling yarn (Y),
wherein the winding speed acquisition section (10) acquires the winding speed based on a speed of the yarn (Y) detected by the speed detection section.
11. The spinning machine (1) as claimed in any one of claims 1 to 10,
wherein the yarn accumulating device (11) includes:
a yarn accumulating roller (30) configured to accumulate the yarn (Y) by the yarn (Y) being wound around an outer peripheral surface, and
a yarn hooking member (31) configured to wind the yarn (Y) around the outer peripheral surface of the yarn accumulating roller (30), and
wherein the control section (10) controls the driving section (23) so that a distance (D) between an unwinding point at which the yarn (Y) is unwound from the outer peripheral surface of the yarn accumulating roller (30) and an engaging point at which the yarn (Y) is engaged in the yarn hooking member (31) is 10 cm or less.

12. The spinning machine (1) as claimed in any one of claims 1 to 11, comprising a rotation detection section (25) configured to detect the number of rotations of the package (P).
13. The spinning machine (1) as claimed in any one of claims 1 to 12, comprising a setting section (100) configured to set the winding ratio including at least a value of a decimal point and the winding angle.
14. The spinning machine (1) as claimed in any one of claims 1 to 13, wherein the control section (10) controls the driving section (23) and the traverse device (13) so that the package (P) is formed by step precision
winding.